<template>
    <div class="Header">
        <router-link
        tag="div"
        :to="{'name': 'Home'}"
        class="header-abs"
        v-show="showAbs"
        >
          <div class="iconfont header-abs-back">&#xe624;</div>
        </router-link>
        <div
        class="header-fixed"
        v-show="!showAbs"
        :style="opacityStyle"
        >
          <router-link :to="{'path':'/'}">
            <div class="iconfont header-fixed-back">&#xe624;</div>
          </router-link>
          景点详情
        </div>
    </div>
</template>

<script>
export default {
  name: 'Header',
  props: {},
  data () {
    return {
      showAbs: true,
      opacityStyle: {
        opacity: 0
      }
    }
  },
  computed: {},
  watch: {},
  methods: {
    handleScroll () {
      let top = document.documentElement.scrollTop
      if (top > 60) {
        let opacity = top / 140
        opacity = (opacity >= 1) ? 1 : opacity
        this.opacityStyle = {
          opacity
        }
        this.showAbs = false
      } else {
        this.showAbs = true
      }
    }
  },
  components: {},
  created () {
  },
  mounted () {
  },
  activated () {
    window.addEventListener('scroll', this.handleScroll)
  },
  deactivated () {
    window.removeEventListener('scroll', this.handleScroll)
  }
}
</script>

<style scoped lang="stylus">
@import "~styles/variable.styl"
  .header-abs
    position: absolute
    left: .2rem
    top: .2rem
    width: .8rem
    height: .8rem
    line-height: .8rem
    border-radius: .4rem
    text-align: center
    background: rgba(0, 0, 0, .8)
    .header-abs-back
      color: #fff
      font-size: .4rem
  .header-fixed
    z-index: 2
    position: fixed
    top: 0
    left: 0
    width: 100%
    height: $headerHeight
    line-height: $headerHeight
    overflow: hidden
    text-align: center
    color: #ffffff
    background: $bgColor
    font-size: .32rem
    .header-fixed-back
      position: absolute
      top: 0
      width: .64rem
      font-size: .4rem
      text-align: center
      color: #ffffff
  .content
    height: 50rem
</style>
